Don't know if it has been brought up already, but within AIDA there circulates a document originally authored by Frenchman Jean Waldmann. This document lists various criteria in the categories "Blackout", "Samba", "Fatigue" & "Clear", the latter two being acceptable. "Cardiac arrest" f.i. is labeled "Blackout" (!) and so forth. The purpose of the document is to act as a an aid to judges when deciding on exits
I'm enthusiastic about this document and use it as a Danish judge, because it brings at least some level of objectivity into the judgment of, in particular, samba. Personally, I think AIDA should just include Waldmann's list into the regulations and make the various distinctions official. No more subjectivity.
I have attached the document to this post, it's in .xls. It's a bit outdated as compared to present regulations, but still it gives you guys a hint.